A first kiss should always be done while the two of you are alone. This will help to avoid any unnecessary nervousness and embarrassing situations.
The best type of kiss is one that uses different variations...
such as starting with a small kiss, working into a French Kiss, maybe sucking on your partner's upper or lower lip...

And don't just leave kisses to the lips.
Kiss their cheeks, their chin or their eyelids.
This can be very seductive and romantic.

Basic Kissing Tips

Great Breath - This is very important. Make sure you brush your teeth before going out on your date. There is nothing worse than kissing someone with bad breath.

If your date consists of having something to eat before the actual kiss, make sure you have a mint on hand to take right after you finish eating. Don't take the mint just before the kiss or chew on gum. You don't want to have something in your mouth when you kiss.

Moist Lips - You want your lips to be slightly moist when you kiss. Run your tongue over your lips once before you kiss. Don't wear lip gloss because that tends to make the kiss too gooey.

And don't wear a lot of lipstick unless you want your partner to wear it too after the kiss. Slightly moist lips makes it easier to move your lips over your partner's and gives both you and your partner a more pleasant experience.

Positioning - Stand close to your partner. As the two of you move closer together tilt your head slightly. If you can see which way your partner's head is tilting, tilt your head slightly in the opposite direction.

Close Eyes - Just before your lips meet, close your eyes. Some people prefer to leave their eyes open during the kiss. But until you know what your partner prefers, it is best to close your eyes.

Open Lips - Open your mouth slightly and place your lips over your partner's lips. Do not hold your breath! Breath through your nose. As your lips meet, press them gently over your partner's. You may wish to move your lips in a slow, circular motion or just leave them still over your partners.
Closed Lips - This is like the type of kiss you'd give your grandma or aunt. Instead of opening your mouth when your lips meet, keep them closed. This is also a good way of letting your partner know this is as far as it goes. It also makes a great hello/good-bye kiss or a great first time kiss if you're nervous.